Made of 304 double-layer food-grade stainless steel, this customized 17oz insulated mug vacuum flask features vacuum insulation to keep drinks hot or cold for long periods. It is designed with vacuum insulation to keep beverages hot or cold for a long time. And available in matte coating color. Pure hand-polished rounded mouth of the cup, fit with the lips, comfortable drinking without cutting the mouth. Recessed bottom design, easy to place smoothly. They are environmentally responsible, BPA-free, reusable, and recyclable.